基于苏通大桥混凝土短期试验结果的徐变预测模型修正

Modification of Creep Prediction Models Based on Short-Term Concrete Test Data of Sutong Bridge

为提高混凝土长期徐变预测精度,通过对不同加载龄期的苏通大桥用3组高强混凝土进行徐变试验,根据1个月内的试验结果,采用不同方法对ACI 209R,CEB-FIP 1990和B3徐变预测模型分别进行修正,通过比较变异系数及1年徐变试验结果,分析不同修正后模型的预测精度,结果表明,对于苏通大桥用高强混凝土,修正B3徐变模型具有最高的预测精度。

To enhance the prediction accuracy of the long-term concrete creep,the creep tests for three groups of the high-strength concrete with different loading ages for Sutong Bridge were made.Based on the test data of the concrete within one month period,the different methods are used to respectively modify the model ACI 209R,model CEB-FIP 1990 and model B3 for creep prediction.Through comparison of the variant coefficients and the one year period creep test data,the prediction accuracy of the different modified ...